Door-bell



(No Model.)

F. SANDERSON. DOOR BELL.

No. 432,285. Patented July 15, 1890.'

WW @MM NITED 'STATES PATENT FREDERICK SANDERSON, OF CHICAGO, ILLINOIS.

DOOR-BELL.

vSPECIFICTION forming part 0f Letters Patent No. 432,285, dated J'uly 15, 1890.

Application tiled February 26, 1890. Serial No. 341,884. (No model.)

To all whom it may concern:

Be it known that I, FREDERICK SANDERsoN, a citizen of theUnited States, residing at Ohicago, in the count-y of Oook and State of Illinois, have invented a new an d useful Improvement in Door-Bells, of which the following is a specification.

My invention relates to that class of doorbclls which are applicable to either doors or door-jambs, or other similar situations, without making any radical change in the operative mechanism.

One object of my invention is to arrange the pivotal center of an elbow-lever which operates the hammer in relation to the pivotal center of the elbow-leve1"s connection with the push-button so that a very slight push upon the push-button will cause t-he hammer to give two distinct strikes upon the bell.

Another object is to provide two arms to the hammeroperating elbow lever, which arms contact with stops on the frame to which the elbow-lever is pivoted, for the purpose of limiting the motion ol' said elbow-lever for the purpose ot' causing a quick retraction of the hammer f rom the bell after it has struck.

Another object is to so connect the pushbutton and thc leverwhich operates the hammer that the connection will be in alignment by the introduction ot' a bifurcated pitman, which permits the hammer to vibrate vertically wit-hin the space between the two arms of the bifurcation of said pitman.

Another object is to provide a self-centering part to the side ot the apparatus where it contacts with the door, which also acts asa guide for part of the operative mechanism, as will be fully explained. hereinafter.

I attain these objects by the mechanism illustrated in the accompanying drawings, in which-- Figure l is a vertical center section on line A B, Fig. 2, with operative mechanism in elevation. Fig. 2 is a horizontal center section on line C D,Fig. 1,With operative mechanism' and the frame to which the bell is attached in elevation. Fig. 3 is a detached top view of the frame or standard, to the outer end of which the bell is secured, and into which the 5o lever for operating the hammer is pivoted.

' Fig. 4. is a detached side view of the elbowlever for operating the hammer, together with ,and 2.

its spring-arm with hammer attached. Fig. 5 is a perspective rear view of the base by which all the apparatus of the bcll is attached to the door. Fig. 5 also shows self-centering device and guide for button-rod` Fig. `G shows respectively side and top detached views of bifurcated connection between push-button rod and ham mer-operating elbow-lever. Fig. 7 shows part of the door with hole and position of self-centering device, as will be described.

Y Similar letters refer to like parts in the several views.

E is a bell, which is secured to the end of frame F by means of a screw c. F, Fig. 3, is secured to the base-plate G at b. The plate G is circular in shape, Fig. A5, and in l, 2, and 3 is shown a flange c around its outer edge. This plate G is provided with screw-holes d, Fig. 5, which are occupied with wood screws for firmly attaching it to its proper'position ou a door or any other place desired. The head of the frame F is slotted out near the end at c, and into this slot is pivoted lan elbow-lever I-I upon a pin f, Figs. l

The lever H vibrates in a vertical direction, and it is provided with two projections g and 71 which contact with shoulderst andj on the head of the frame F, th us limiting the movement ot the elbow-lever l-I. One arm of the elbow-lever I-I is formed by the spring-rod 7o, which has the hammer I secured to its outer end. To the short arm of the elbow-lever I-I is pivotally attached by a piu Z,

site end is guided and slides in the hole p in the 4lJ-shaped part L, Fig.' 5, which is at the center of the rear side of the plate G. This U-shaped part serves also another purpose. Y

When the door-bell is to be attached, a hole N is bored through the door. The dimensions of the part L from any one ot its corners to the diagonally-opposite. corner is slightly larger than the diameter of the hole N, so that the The frame ICC part L is forced into the hole N, and thus centers the plate G, together with the attached operative mechanism, as shown by Fig. 7. Thus but few screws are required to secure the plate G to a door, and it is prevented from even slightly changing its position when once in place.

In operation one push inward upon the pushbutton K causes the rod o to contact against the end of the bifureatcd connection m, the con neclion m being pivoted to the elbow-lever II at l in such a relati-ve position to the pin f that when the several operative parts of the apparatus are in normal position when atl-est the two centers fand lare almostin line with a center line from the pivotf to the rod o and the pushbutton, and for this reason a very small inward movement of the push-button will cause the elbow-lever to turn on its pin f, and through the medium oi' its spring-arm k cause the hammer I to quickly rise and strike the inside top of the bell, as shown by the dotted lines, Fig. l. As soon as the pressure is removed from the push-button K, the hammer I, by its own weight, ialls and strikes a second blow upon the inside of the bell at the bottom, Fig. I. rlhe hammer I and its springarm 7a in both their upward and downward strokes pass between the bifurcations of the connection m, so that pressure upon the pushbutton is transmitted centrally and with no side draft to the hammer-operating lever II. The hammer is instantly retracted from the bell after it has struck by means of the springarm 1. `The elbow-lever II does not vibrate enough to throw the hammer against the bell at either the top or bottom stroke; but when the ends of the arms g and 7i contact with the shoulders t' and j, limiting the stroke ofthe elbow-lever, the momentum of the hammer I springs the arm 7e enough to cause the hammer to contact with the bell; but as soon as the blow is delivered the bent spring-arm 7s instantly withdraws the hammer, when it stands at the top or bottom of its stroke in the relative position shown in Fig. l. The gravity of the hammer I, acting upon the clbow-lever II, through the medium of the connection m and rod o, always holds the pushbutton outward with its shoulder in contact with the escutcheon K.

It will be noticed in Fig. l that the pivotal centerf of lever II and the pivotal center l of the end of bifurcated connection m are almost in line with the longitudinal center of the push-button rod o when the mechanism is at rest, and on this account the elbow-lever II startsa little hard at first pressure upon the push-button, but when started it turns suddenly upon its pivotal pin f, causing the hammer I to deliver a quick upward blow upon the bell, the natural result of which 1s that the person pushing the button, after hearing the sound of the bell, will instantly release the pressure, when the gravity of the hammer descending will cause the second blow on the bottom of the bell. Thus a quick succession of blows can be delivered on the bell by means ot' this simple arrangement of mechanism.

That I claim as my invention, and desire to secure by Letters Patent, is

l. In a door-bell, the elbow-lever II, pivoted in siot c of frame F, spring-arm la, attached to said lever II, hammer I, attached to said arm 7.3, bifureatcd connection m, pivoted at l to said elbow-leverII, spring-arm 7.1, and hammer I, operating vertically between the bifurcations of said connection fm., in the manner and for the purpose substantially as shown and described.

2. In a door-bell, the elbow hammer-arm operating lever II, provided with stop-arms y and 7i, said elbow-lever II being limited in its motion on pin f by said stop-arms g and 7L contacting with shoulders i' and j, for the purpose hereinbet'ore described.

3. In adoor-bell, the bifurcated connection m, pivoted at one end to elbow-lever II and supported and operating at the opposite end in notches n in the sides of slot J of baseplate G, one end of rod O contacting with the end of connection m, as shown, said rod O having attached at its opposite end a pushbutton K, all for the purpose of connecting push-button K with and operating` elbow-lever H by pressure on said push-button K.

4. In a door-bell, the frame I", Vprovided FREDERICK SANDERSON.

"Witnesses:

J. A. MILLER, F. RIERNDICK.

IOO

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